Darcy & Rachel Series by Emily Giffin

Rachel White is the consummate good girl. A hard-working attorney at a large Manhattan law firm and a diligent maid of honor to her charmed best friend Darcy, Rachel has always played by all the rules. Since grade school, she has watched Darcy shine, quietly accepting the sidekick role in their lopsided friendship. But that suddenly changes the night of her thirtieth birthday when Rachel finally confesses her feelings to Darcy's fiance, and is both horrified and thrilled to discover that he feels the same way. As the wedding date draws near, events spiral out of control, and Rachel knows she must make a choice between her heart and conscience. In so doing, she discovers that the lines between right and wrong can be blurry, endings aren't always neat, and sometimes you have to risk everything to be true to yourself.

Darcy Rhone thought she had it all figured out: the more beautiful the girl, the more charmed her life. Never mind substance. Never mind playing by the rules. Never mind karma. But Darcy's neat, perfect world turns upside down when her best friend, Rachel, the plain-Jane good girl, steals her fiance, while Darcy finds herself completely alone for the first time in her life with a baby on the way.

Darcy tries to recover, fleeing to her childhood friend living in London and resorting to her tried-and-true methods for getting what she wants. But as she attempts to recreate her glamorous life on a new continent, Darcy finds that her rules no longer apply. It is only then that Darcy can begin her journey toward self-awareness, forgiveness, and motherhood.

Something Blue is a novel about one womans surprising discoveries about the true meaning of friendship, love, and happily-ever-after. It's a novel for anyone who has ever, even secretly, wondered if the last thing you want is really the one thing you need.